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Genetic analysis in tetraploid wheat

KrishiKosh

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Title Genetic analysis in tetraploid wheat
 
Creator B.Subhashchandra
 
Contributor H.C.Lohitaswa
 
Subject Genetics and Plant Breeding
 
Description A study was undertaken during 2005-06 rabi season in wheat improvement
project field, University of Agricultural Sciences, Dharwad, on eight parents, their F2
progenies (without reciprocals) obtained from selfing of 28F1s generated by crossing the
parents in a half diallel mating design, to investigate the nature of combining ability of
different parents and gene action. Extent of variability, heritability and the genetic advance,
correlation between yield and yield attributing traits were also computed and also ensures to
determine the relationship between genetic diversity and transgressive segregants.
Analysis of variances for combining ability revealed that both GCA and SCA
variances were important for all the characters and the characters like plant height, spike
length, sedimentation value, -carotene content and protein content showed the predominance
of additive gene action. The variability study indicated moderate to high phenotypic and
genotypic coefficient of variation accompanied by high heritability and genetic advance for
days to 50% flowering, days to 80% maturity, spike length, productive tillers per plant,
protein content and yield per plant and hence these characters are amenable for simple
selection of superior segregants.
Correlation studies indicated that yield per plant had significantly positive association
at phenotypic and genotypic level with spike length and productive tillers per plant. Days to
50 per cent flowering, spike length and productive tillers per plant also showed positive direct
effect on yield.
It is also evident from the diversity analysis that specific combination of parents HW-
2000 × DWR-1006 having more inter cluster distance have yielded more number of
transgressive segregants indicating the relationship between genetic diversity and
transgressive segregants.
 
Date 2016-10-24T16:33:36Z
2016-10-24T16:33:36Z
2007
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81584
 
Format application/pdf
 
Publisher UAS, Dharwad